rest: match paths using regexp

[mgenov]

Adds regex pattern matching on paths, so path variables could be more
complex that are now.

Here are some examples

/r/users/:id{\d+}

will match only

/r/users/123

but not

/r/users/john

Note: testng version was updated in pom.xml due issue with latest Intellij IDEA 15. If this change is breakable, the pom.xml changes will be reverted.

[mgenov]

cc @jvanzyl @dhanji

[mgenov]

Another possible option would be brackets to wrap variable and regexp: {id:\d+}

[mgenov]

ping

[mgenov]

ping2