Merge pull request #30 from boyks/master

dialogs.py, wizard.py PEP8 errors fixed
implemented source_loader (fix #3)
implemented spec (fix #4)
assigned components together
2-5,7 pages' validations
removed __init__ from ProjectBuilder
Merge branch 'upstream'
Dialog for adding subpackage added

Added buttons to subpackage dialog

Tags and scripts validations

Filter for file browser (user can choose only dir)

Also there is an output to the stdout for checking scripts and tags
README: added requirements and license
added LICENSE file
extended README
modified README
plugin find_patch: fixed wrong assigment to spec
connected GUI with base methods
Get file from import works
Filter for import directory added
GUI: fixed typos, removed depracated fields, reorder of items
pep8: fixed test_plugins.py file
implemented Command helper class (fix #33)
command: splits by lines single string command