Target rate update (#265)

* pulled deployed proxy implementation

* target rate update

* reverted rename

* renamed log event

* updated scalar math

* added upgrade script and renamed variable

* added decimals constant

* added oracle scaler to the init function

* removed timestamp from rebaselog

* updated natspec

* Update contracts/MedianOracle.sol

Co-authored-by: Brandon Iles <brandon.iles@gmail.com>

* deployed new policy implementation

* added task to deploy oracle

---------

Co-authored-by: Brandon Iles <brandon.iles@gmail.com>

Author: aalavandhan

.gitignore

@@ -81,7 +81,6 @@ node_modules
 #Buidler files
 cache
 artifacts
-.openzeppelin
 
 # env
 .env

.openzeppelin/.gitignore

@@ -0,0 +1 @@
+unknown-*.json