Fix upgrade error
Add colored logs
Fix verbose level in global rebar config
Replace application:set_env on erlang:put
Merge branch 'color_in_logs' of https://github.com/platinumthinker/rebar into platinumthinker-color_in_logs

Conflicts:
	THANKS
Merge branch 'platinumthinker-color_in_logs'
Revert "Merge branch 'platinumthinker-color_in_logs'"

This reverts commit 49930fe56656b46b6a35e4bcc92f4a18a402726a, reversing
changes made to 6e6b0fd43fe4e6ebf34808b9cf39a74b5d7946a2.
Merge branch 'fix_upgrade_error' of https://github.com/terrencehan/rebar into terrencehan-fix_upgrade_error
Additional fixes and modification

- Updating documentation to be more accurate
- Style fixes
- More precise error messages
Merge branch 'terrencehan-fix_upgrade_error'