retrofitting behat fixes from my repro

• the regex for the behat save verb will technically work but is very poor looking. I added needed whitespace without breaking backwards compat if someone did like the Idonthavewhitespacebetweenthings approach.
• added function to be able to check x.x.x version numbers and then added a behat verb to enable using the function
• added the ability to define a remote db host to use rather than the default (127.0.0.1). It now checks for the RESTFUL_TEST_DBHOST environment variable and uses that host if defined.

None of these fixes break compatibility. They silently enhance the test suite.