use binstubs to speed up spring
don't use binstubs if cannot create them
Use ./bin/spring if it already exists
Merge pull request #3 from medvedobijec/master

Use ./bin/spring if it already exists
add :rspec_cli option for Guardfile configuration

:rspec_cli allows to specify additional options passed to rspec.
update README.md - add info about guard-rspec

The support for Zeus and Spring was added to the `guard-rspec` project.
Merge pull request #1 from mknapik/master

update to 0.0.4