Solve Issue94

[roeles]

These commits should solve #94. It was solved in two stages:

1. Solve an import error which I encountered both at home and on travis-ci, by adding a dir to the python system import path.
2. Solve the actual IGC parse error by ignoring all lines with a length greater than 76 characters.

[GliderGeek]

thanks for working on this @roeles and specificaly for pointing me towards the maximum line length of an IGC file.

i probably won't merge this request:

• it seems to create another problem with #88
• i am planning to replace all the IGC reading functionality with logic from aerofiles (#100)

[roeles]

You are welcome. Glad you learnt from it. Don't worry about not merging this.