Feature/windows build correction

This patch allows to build eXist on Windows 7. 

All 3 commits steps were due to a git flow feature finish done before git flow feature publish.

Last commit comment was


*  Opened related issue https://github.com/eXist-db/exist/issues/385

Warning suppression:
The obsolete usage of xslt style location has been updated.
The new location is relative to the project. The subdirectory
installer has been inserted before the install.xsl style.

Failing building:
The Saxon factory has been added to force Saxon usage and acces to the tokenize function.

Failing building:
The processing of xar are failing due to Linux dependent usage of file separators