Merged code with similar functionality and Deleted unused files

Merged Client and GlobusOnlineRestClient
- the new merged class is called MergedClient (at least for now)
- still need to refactor the MergedClient

Merged the Client and GlobusOnlineRestClient test cases
- the new merged test cases are in merged_client_tests.py in lib/merged_tests
- this includes the tests form the transfered go_rest_cleint_tests
- fomated the test cases to be a little more uniform

Deleted the vendor directory

Deleted the 'new' tests folder containing the transfed go_rest_client_tests
- no longer need this folder because the tests have been merged

Moved the test_utils folder to lib/test_utils
- needed to move because the merged_tests require test_utils
- also because the original tests have been deleted