Add Rubocop
1.9.3 support for Rubocop
Revert "1.9.3 support for Rubocop"

This reverts commit 165b554958ec412941b0ea55fd9de2870c9e9480.
RuboCop 1.9.3 fixes redux
Fix indent
Merge pull request #419 from kou/patch-1

Fix indent
Proposed fix for https://github.com/celluloid/celluloid/issues/426
If the backtrace is not an array, it crashes. https://github.com/celluloid/celluloid/issues/428
Merge pull request #429 from ioquatix/fix-backtrace-unavailable-array

If the backtrace is not an array, it crashes.
Test in ruby 2.1.2
Merge pull request #433 from cibernox/patch-1

Test in ruby 2.1.2
Merge pull request #432 from ioquatix/borked-evented_mailbox-receive

Fix broken reactor interaction with timers.
Added exclusive monotonic timeout class - consider adding directly to timers.
Handle timeout error from EventedMailbox.
simplify core detection
Remove rubocop from CI

Really needs someone to clean up the existing failures
Merge pull request #437 from chronomantic/os_detection_cleanup

simplify core detection
Updated to use timers 3.0 when it is available.
whitespace removed.
Merge pull request #435 from ioquatix/fix-linking-timeout

Fix linking timeout