Pycap

- By default, in longitudinal projects when exporting records as a data frame, the index will be a MultiIndex of the project's primary field and `redcap_event_name`.
- DataFrames can be passed to `Project.import_records`.
- Added `Project.export_fem` to export Form-Event Mappings from the `Project`.
- The SSL certificate on REDCap server can be ignored if need be.

- Added rest of API methods: `Project.export_users`, `Project.delete_file`. Almost all API methods are implemented within `Project` in some way, shape or form.
- Fix file import bug.
- Now use relaxed JSON decoding because REDCap doesn't always send strict JSON.
- File export, import and delete methods will raise `redcap.RedcapError` when the methods don't succeed on the server.
- Low-level content handling has been cleaned up.

- Added `Project.export_file` and `Project.import_file` methods for exporting/importing files from/to REDCap databases
- Fixed a dependency issue that would cause new installations to fail
- Fixed an issue where newline characters in the project's Data Dictionary would case Projects to fail instantiation.

- Add ability to alter `DataFrame` construction with the `df_kwargs` arg in `Project.export_records` and `.export_metadata`

- Add `export_metadata` function on redcap.Project class
- Add `'df` as an option for the `format` argument on the `redcap.Project` export methods to return a `pandas.DataFrame`

- Update `setup.py` for more graceful building