post reach
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[fb-impact-insights] Removed unused stuff, PEP8 and structure improvements
[fb-impact-insights] Move common functions to fb_utils.py

- Make accessToken global
[fb-community] Several bugfixes and less verbosity

Catch empty data in get_insight()
It was causing a crash since for some old posts,
for task=post_impressions_paid_unique the "data" json attribute is empty...
Update gitignore
[fb-community] Free webdriver
page post statistics
[fb-comments] PEP8 and imports from fb_util
[fb-impact] PEP8 and imports from fb_util
[fb-impact-insights] PEP8 and imports from fb_util
Added get_access_keys_from_file() to fb_utils.py
[fb-post-reach] PEP8 and imports from fb_utils
[fb-insights-page-impressions-by-age-gender] PEP8 and imports from fb_utils
[fb-insights] PEP8 and imports from fb_utils