Fixed Date Parsing Issue

Fixes #381
Minor code style tweaks

* Remove spurious empty lines
* Wrap lines at 100 chars
Fixed an amount parsing error in expressions

Fixes #379
Merge branch 'master' into develop

Conflicts:
	core/model/date.py
polib is now on PyPI
Moved credits into a language-independent file
Added Nelson Brown to the credits
Changed copyright year to 2014
Fixed copyright year
v2.7.2
Fixed build script for OS X
Fixed wrongly named credit.tmpl files in doc
Merge branch 'master' into develop

Conflicts:
	README.md
	hscommon/io.py
	hscommon/tests/reg_test.py
Package PyPI dependencies right into our source package
Partially documented core.gui.base

This takes a loooong time to document...
Updated transifex config
Removed Cashculator integration

Not maintained anymore. It was a bad idea from the start.
Updated locs.
Updated hscommon
Updated qtlib