Add tags for new failing specs

Author: eregon

spec/tags/core/io/gets_tags.txt

@@ -1,2 +1,3 @@
 fails:IO#gets transcodes to internal encoding if the IO object's external encoding is ASCII-8BIT
 fails:IO#gets when passed chomp returns the first line without a trailing newline character
+fails:IO#gets transcodes to internal encoding if the IO object's external encoding is BINARY

spec/tags/core/random/bytes_tags.txt

@@ -2,3 +2,4 @@ fails:Random.bytes returns a String
 fails:Random.bytes returns a String of the length given as argument
 fails:Random.bytes returns an ASCII-8BIT String
 fails:Random.bytes returns a random binary String
+fails:Random.bytes returns a binary String

spec/tags/core/random/raw_seed_tags.txt

@@ -3,3 +3,4 @@ fails:Random.urandom returns a String of the length given as argument
 fails:Random.urandom raises an ArgumentError on a negative size
 fails:Random.urandom returns an ASCII-8BIT String
 fails:Random.urandom returns a random binary String
+fails:Random.urandom returns a binary String

spec/tags/core/string/encode_tags.txt

@@ -0,0 +1 @@
+fails:String#encode when passed options replaces invalid encoding