Runner: display skipped tests only if exists

implode() scream with NULL as argument otherwise.
Runner: show results anytime when exists

Runner shows 'No tests found' although pre-failed exists.
Merge pull request #12 from milo/small-fixes

Small fixes
DataProvider: Show query string in exception message.

Runner: do not append space to query and typo
Assert::$onFailure added
Assert: big variable log filename contain data-provider query
Merge remote branch 'upstream/master'
Happy New Year 2013
Assert::exception() removed self::fail() from try - catch
travis: workaround for missing PHP 5.3 in travis, added 5.5
Merge remote branch 'upstream/master'