Merge pull request #13 from antoine-aumjaud/features/FITNESSE-PLUGIN-FixFitnesseServerStart

Features/fitnesse plugin fix fitnesse server start, use HTTP GET instead of scraping stdout.
[JENKINS-15863][JENKINS-13936] Write HTML content in file when XML is
parsed.
HTML contents of the result was saved in memory before to be written in
files. To avoid OOM, I write the file when the XML si parsed.
Move temporary files to target
format
Improve logs
Remove existing exception on tests
Remove html extension (need to change more code)
improve log
Merge pull request #16 from antoine-aumjaud/features/FITNESSE-PLUGIN-StoreHtmlContentInFileWhenXMLIsParsed

Store HTML content in file during the XML parsing to avoid OOM
Manage duration in fitnesse result file and display it
Rollback auto format
Fix test
Fix test
Add tests
Clean code
Merge issue
Merge pull request #17 from antoine-aumjaud/features/FITNESSE-PLUGIN-RetrieveAndDisplayDuration

Retrieve duration from result
Manage slave and relative path correctly
fix NPE
run java command on slave if OS is different than master's OS