limit added to getCommitMessages()

ducumentation updated

Author: Denis

README.md

@@ -10,7 +10,7 @@ Pk-vcs-git is lightweight library for execute basic Git VCS operations (merge, b
   - Folder where vcs-related operations are executed. Provides thread- and process-safe repository of working folders. See [pk-vcs-api](https://github.com/ProjectKaiser/pk-vcs-api) for details
 - Test Repository
   - Git repository which is used to execute functional tests
-  - Hosted on [Github](https://github.com/) using username and password provided by enviroment variables (see below)
+  - Hosted on [Github](https://github.com/) using username and password provided by environment variables (see below)
   - Generates new before and deletes after each test
   - Named randomly (uuid is used) 
   - [Kohsuke Github API](http://github-api.kohsuke.org/) is used as to work with Github API
@@ -45,7 +45,7 @@ Pk-vcs-git is lightweight library for execute basic Git VCS operations (merge, b
 	IVCS vcs = new GitVCS(repoWorkspace);
 ```
 - Use methods of `IVCS` interface. See [pk-vcs-api](https://github.com/ProjectKaiser/pk-vcs-api) for details
-- Use `vcs.setProxy()` and `vcs.setCredentials()` if neccessary
+- Use `vcs.setProxy()` and `vcs.setCredentials()` if necessary
 
 # Implementation details
 - [JGit](https://eclipse.org/jgit/) is used as framework to work with Git repositories
@@ -58,11 +58,11 @@ Pk-vcs-git is lightweight library for execute basic Git VCS operations (merge, b
 # Functional testing
 - Github is used for hosting the Test Repository
   - [Kohsuke Github API](http://github-api.kohsuke.org/) is used to create and delete Test Repository
-  - `PK_VCS_TEST_GITHUB_USER` enviroment var or JVM var is used as username for access to Github
-  - `PK_VCS_TEST_GITHUB_PASS` enviroment var or JVM var is used as user password for access to Github
+  - `PK_VCS_TEST_GITHUB_USER` environment var or JVM var is used as username for access to Github
+  - `PK_VCS_TEST_GITHUB_PASS` environment var or JVM var is used as user password for access to Github
   - New Test Repository is created before each test and deletes automatically after each test
 - To execute tests just run GitVCSTest class as JUnit test. Tests from VCSAbstractTest class will be executed. See  [pk-vcs-test](https://github.com/ProjectKaiser/pk-vcs-test) for details
-- NOTE: Github has some latency for exposing results of previosly executed operations. For example if create a new branch and immediately check branches list then Github could return old branches list. Need to wait a couple of second to get new list. So if a test failed then try to execute it again. 
+- NOTE: Github has some latency for exposing results of previously executed operations. For example if create a new branch and immediately check branches list then Github could return old branches list. Need to wait a couple of second to get new list. So if a test failed then try to execute it again. 
 
 # Limitations
-- Commit messages can not be atached to branch create and delete operations because Git does not exposes these operations as separate commits
+- Commit messages can not be attached to branch create and delete operations because Git does not exposes these operations as separate commits

src/main/java/com/projectkaiser/scm/vcs/GitVCS.java

@@ -471,13 +471,14 @@ public Set<String> getBranches() {
 	}
 
 	@Override
-	public List<String> getCommitMessages(String branchName) {
+	public List<String> getCommitMessages(String branchName, Integer limit) {
 		try (IVCSLockedWorkingCopy wc = repo.getVCSLockedWorkingCopy()) {
 			try (Git git = getLocalGit(wc)) {
 				Iterable<RevCommit> logs = git
 						.log()
 						.add(git.getRepository().resolve("remotes/origin/" 
 									+ parseBranch(branchName)))
+						.setMaxCount(limit)
 						.call();
 				List<String> res = new ArrayList<>();
 				for (RevCommit commit : logs) {