Revert "updating angulillos dependency version"

This reverts commit 1451f01d4d8bb4d1c708f883b623914ea81f952e.
Revert "Revert "updating angulillos dependency version""

This reverts commit 3490e9c3a65ad7530e8250caf7e082ac23d057ab.
Revert "updating angulillos dependency version"

This reverts commit 1451f01d4d8bb4d1c708f883b623914ea81f952e.
Revert "updating titan version to 0.5.1"

This reverts commit 2c82c2e719a4cc246f46d063f20cd2490a439dd5.
adding initialization of keys missing from ProteinProteinInteraction edge
adding missing key initialization in TitanUniprotGraph
Update ImportingTitanBio4j.md
fixing wrong alternative product type key initialization in TitanUniprotGraph class
fixing wrong alternative product type key initialization in TitanUniprotGraph class
merging, keeping our version
@pablopareja I merged master into this branch, what we need to do is review the stuff about the keys that was wrong before