Cherry picking commits for importing the statement_base_import module
Removed lsv_dd module wich will be in separate branch.
PEP8
Added external dependencies check.
PEP8
Add xml to attachments for postfinance statement import.
[FIX] raiffeisen line parsing, get only last element for amout parsing
[FIX] binary file postfinance import bug
Added example files with import unit tests. Corrected some bugs.
Fixed importation order problem. Added missing modifications to commit.
Conversion_dict is now generated in generic parser...

...adapts to the changes introduced in #23
Corrected Raiffeisen detailed parser.
Corrected pep8 error.
Merge pull request #36 from CompassionCH/7.0-statement-import

Add swiss bank statement imports