Clarify CONTRIBUTING.md

Heads up @zidoms and @erbridge. I shouldn't deal with users and by directing them to another repository I can unwatch I don't have to ;)

Feel free to unwatch also if you don't want to deal with support
fix typo
Improve CONTRIBUTING.md.
Expanded test suite for the util package in Lime Text submitted by schallert, jchoi1, lindzy, shuaisha, & dingty.
Merge branch 'master' into util_test_suite
Expanded test suite for the log package in Lime Text submitted by schallert, jchoi1, lindzy, shuaisha, & dingty
Merge branch 'master' into log_test_suite
Add section 5: "If you'd like to help but don't know how"
Refactoring keys package #196
Added some tests showing the expectations of how should keybindings
work after supporting parent child hierarchy.
Run `gofmt` on util tests
Run `gofmt` on log tests
Make errors fail tests rather than just output
Fix more "Print"s that should be test errors
Merge pull request #462 from schallert/util_test_suite

Expanding the util test suite
Key-bindings parent child support closes #196
Loading all keybindings in proper order
Merge branch 'master' of github.com:limetext/lime into iss196

* 'master' of github.com:limetext/lime:
  Fix more "Print"s that should be test errors
  Make errors fail tests rather than just output
  Run `gofmt` on util tests
  Add section 5: "If you'd like to help but don't know how"
  Expanded test suite for the util package in Lime Text submitted by schallert, jchoi1, lindzy, shuaisha, & dingty.
  Improve CONTRIBUTING.md.
  fix typo
  Clarify CONTRIBUTING.md
  implemented select keybindings for shift+arrow
  Replace BufferChangedCallbacks to BufferObservers in frontend code (#427)
  Resolve #25: Implement the find_next command
Change keyOff name to seqIndex
No need to extra variable r
Merge pull request #463 from zidoms/iss196

Key-bindings "parent, child" support