fix bugs about library loading for multiple descriptors import
add unit tests and test data for multiple descriptor importing
add samples for multiple descriptor importing
update multi descriptors importing demo to trigger main problem of current version
fix an error while there is no commomLib, need to bypass resolvedCommonLib composing
add a lib into test params which will cause lib path error
update demo files for multiple descriptors import
Merge pull request #248 from kenyeah/master

fix bugs about library loading for multiple descriptors import
Merge pull request #267 from pranavparikh/master

Fix for supporting context with datadriven descriptors
Preparing for v0.6.5