Build non resource demanding techs inprocess (close #250)

Build non resource demanding techs in the main process instead of the forked one. Return techs to build using fork() in BundleNode->getForkedTechs(), others will be built inprocess.
Tests bem-bl submodule is updated to 0.2 (close #264)

- tests bem-bl updated
- tests fixed to inherit i18n.js from js-i to build files with include directives (close #265)
Add fork support to bem create command