Add StartsWith, EndsWith comparison operators
Merge pull request #26 from gogume/starts-ends-with

Add StartsWith, EndsWith comparison operators
Update email address.
Remove some dumb docblock annotations.
Minor CS fix.
Remove dependency on Pimple.

Pimple 2.x has changed to shared-services-by-default, a decision that’s awesome for a DIC, but not as awesome for a general purpose lazy value bucket like we’re using Pimple for. Since this will likely cause problems with apps which use both Ruler and Pimple, I have removed the Pimple dependency and implemented the Pimple 1.x API directly on Context — using Pimple 2.x-flavored code :)

The extend() method has not been ported to Context, as that seems like a side effect of using a DIC as a base class, more than an explicit feature for the Context. But I’m happy to be proven wrong if someone really needs it.
Test all the versions!
allow hhvm to fail
Merge pull request #29 from bobthecow/feature/remove-pimple-dependency

Remove dependency on Pimple.
Heh. It was double-wrapping set operation results :)
Allow external operator use

Conflicts:
	src/Ruler/Variable.php
	tests/Ruler/Test/VariableTest.php
Register external operators on RuleBuilder instance
Update README section on external Operators.