The issue appears when there is no boto, jinja and some other libraries
are not installed because the classes which use these libraries are
still being imported inside the package file. The fix removes those
imports from package root, because they should not be here, in fact,
content of report and upload packages must be imported only inside the
trigger class and only if they are actually required
This commit also adds setuptools as required dependency since it is used
for some parsers (previously it was provided dependency)
* migrate docstrings from reST to google format
* add raises note
Also change behaviour of the `from_option` method to fallback to
disabled instead of raising exception on unknown option
* fix part of warnings for sphinx
* make identation a bit more readable
* review fixes
* add verbose description for properties to make them parsed by sphinx extenstion
* add demo sphinx generator
