Add support for negated boolean commands (e.g. 'isTextNotPresent')
Unit test for 'do verifyTextPresent'
Unit test for 'is isTextPresent'
Returning the value of a negated boolean command
Merge branch 'master' into negated_boolean

Conflicts:
	src/main/java/com/xebia/incubator/xebium/SeleniumDriverFixture.java
Merge pull request #76 from xebia/negated_boolean

Add support for negated boolean commands (e.g. 'isTextNotPresent')