Fixing typo in README
whitespace
Exponential back-off

Add ability to supply Proc/lambda to the sleep parameter, to give more flexibility.
Merge remote-tracking branch 'kamui/master'

Conflicts:
	README.markdown
Update interval to take an optional Proc. Can be used for exponential backoff.

Merge commit '670a7e3f6b57bc89'

Conflicts:
	CHANGELOG
	README.markdown
	lib/retryable.rb
	retryable-rb.gemspec
	test/retryable_test.rb
Merge pull request #3 from haruska/master

Allows for exponential backoff via Proc for interval