check_dependencies.py fails on version numbers with letters

[Arjan Schrijver]

The check_dependencies.py script fails when a software package is checked that has other characters than only numbers in the version.

My example:
sqlalchemy was installed with easy_install on Windows XP. The version number of sqlalchemy is 0.8.0b2
check_dependencies.py fails with the following stacktrace:

Traceback (most recent call last):
  File "C:\footer_onlytitle\scripts\check_dependencies.py", line 190, in <module>
    main()
  File "C:\footer_onlytitle\scripts\check_dependencies.py", line 185, in main
    verify_versions()
  File "C:\footer_onlytitle\scripts\check_dependencies.py", line 124, in verify_versions
    check_vers(sqlalchemy.__version__, VERS['sqlalchemy'], 'sqlalchemy')
  File "C:\footer_onlytitle\scripts\check_dependencies.py", line 94, in check_vers
    version = map(int, version)
ValueError: invalid literal for int() with base 10: '0b2'

[Arjan Schrijver (arjan-s)]

Forgot to mention that this happens on both 2.0 and current trunk.

[Arjan Schrijver (arjan-s)]

I updated the fix according to the feedback.