* add fileKey encryption to GridFSBucketStorageAdapter
* remove fileAdapter options from test spec
* ensure promise doesn't fall through in getFileData
* switch secretKey to fileKey
* add fileKey rotation for GridFSBucketAdapter
* improve catching decryption errors in testcases
* add testcase for rotating key from oldKey to noKey leaving all files decrypted
* removed fileKey from legacy test links. From the looks of the tests and the fileKey was appended to links. This key is now an encryption key
* clean up code
* make more consistant with FSAdapter
* use encryptionKey instead of fileKey
* Update ParseFile.spec.js
revert