Spec to check encoding remains the same after ARGF read and gets
ARGF Binmode should set the file encoding to ASCII-8BIT
Untag implemented specs
Add specs for String#insert and resulting encoding
Fix String#insert for changing encodings and compatibility
Merge pull request #2521 from anupnivargi/argf_spec

ARGF Binmode should set the file encoding to ASCII-8BIT
Fixed bad merge of Enumerator for 2.1.
Updated rubygems to 2.1.0.rc.1.
Merge remote-tracking branch 'origin/master' into compiler

Conflicts:
	kernel/common/string21.rb