LetsEncryptClientError
Less generic exception for subprocess.check_call.

https://docs.python.org/2/library/subprocess.html#exceptions
Less generic exception catching in send()
Merge remote-tracking branch 'github/master' into bugs/44

Conflicts:
	letsencrypt/client/client.py
PEP8 support for acme, acme_test, apache_configurator
PEP compliance logger.py
PEP8 compliance main.py
Fix recent commits style
Revert acme to 43ae01b
Merge pull request #76 from kuba/style-0

Fix recent commits style
Merge pull request #77 from kuba/style-1

Revert acme to 43ae01b
Merge remote-tracking branch 'github/master' into bugs/44

Conflicts:
	letsencrypt/client/apache_configurator.py
Added TODOs and a warning
Raise errors.LetsEncryptClient error in send().
Resolved issue where command line arguments were not being printed due to a type conversion error.
Merge pull request #71 from kuba/bugs/44

Towards better exceptions...
Merge pull request #79 from w0uld/fix_print_options

Resolved issue where command line arguments were not being printed due t...
First pass for proper documentation of apache_configurator
Add sphinx documentation for augeas_configurator
Refactored command line code to use argparse.