issue 138 implemented waitFor method
Merge branch 'master' of https://github.com/jaroslawZawila/rest-driver into jaroslawZawila-master

Conflicts:
	rest-client-driver/src/main/java/com/github/restdriver/clientdriver/RestClientDriver.java
	rest-client-driver/src/test/java/com/github/restdriver/clientdriver/unit/RestClientDriverTest.java
Make a couple of small alterations to waitFor functionality