Reworked ProjectScript and ClasspathResolver to support bootstrap projects.

Bootstrap projects work recursive. Currently, there were no default scheme handler registered and also some useful logging is missing (was dropped).
Remnoved SBuild 0.7.4 from travis setup.
By default add the scan scheme handler.
Improved bootstrap loading. No, defaults are working again.

The defaults will be loaded by a code in the new module org.sbuild.runner.bootstrap. Also, some additional entries to the classpath.properties are needed.
The new default will not contain the Addons and the Ant Support and Wrappers packages.
Merge branch 'master' into bootstrap
Also collect the analyzed data of scala compiler plugin for bootstrap projects.
Updated German translations.
Detect ambiguous types used in Path[T].apply.
Merge branch 'master' into bootstrap
Added cycle detected for @bootstrap annotation.
Merge branch 'bootstrap' into master