Change wording for physics section
Merge pull request #6 from xysmas/physics-spec-update

Change wording for physics section
Proofreading edits, layout changes
Merge pull request #7 from xysmas/proofread

Proofreading edits, layout changes
final version of specs updated and converted to tex/pdf
added packet documentation
Asteroid field and buggy ship created, point lighting and textures
added.
Create Picture.java
Create WalkerClient
Create WalkerServer
Create WalkerThread
description and how-to-use added
saving files before updating line endings
Merge branch 'server_dev' into dev