Update travis config to perform a release build.
Submit search form with GET instead of POST

This is convenient, and also makes the 'To save this search as a link, paste
the text below into a page.' functionality on the search results page actually
work
Make the 'search' page more consistent with the 'properties' page

Renamed 'obsolete' to 'Skip' and moved it under the list of page types.
Merge pull request #305 from raboof/searchlink

Submit search form with GET instead of POST
Remove td/th border style from generic wiki page style sheet.
Allow test systems to add listeners.
Create an Assetion interface in fitnesse.testsystem.
Create interface for Assertion and TestResult.
Create fitnesse.testsystem.ExceptionResult interface
Create interface fitnesse.testsystem.Expectation, to be used in listener.
Create fitnesse.testsystem.Instruction. Reduce external dependencies on testsystems package.
Merge branch 'testsystemlistener' (#311)