Opentargets

- added statistics module to allow score computation on subset of data
- improved fetching efficiency for big requests
- to_json method works with iterator pattern
- improved docs, and changed to Google Style
- set specific user agent for requests sent
- added methods to explore the REST API documentation and available endpoints
- added ping method to check for the api to be reachable

- Added option to export data as JSON, csv, excel or pandas dataframe. (optional dependency for pandas and xlwt)
- Fixed post calls and qutomatically switch to post for a large request

- Added filtering support to IterableResult
- Added parsing of swagger YAML for query validation

Minor:
- bugfixes
- improved tests
- improved docs

First alpha release