add a segment to show network usage statistics
Update README.md
Updated README with VCS problem
Fix URL in README.
Add segments that give greater detail about vcs

Note: In the current implementation, I have only added git support.
This is because I generally do not deal with svn and hg repositories
at the moment and do not know the best way to implement them. In some
cases, these segments may be meaningless for certain vcs's (i.e.
staged/prepared files may not be meaningful in svn). A description is
given below

* new file:   segments/vcs_compare.sh
    This compares the current branch with that of it's remote branch (as
    reached with "git fetch"). It may look like: ↓ 3 ↑ 2
* new file:   segments/vcs_modified.sh
    This shows the number of items that are modified and not staged
* new file:   segments/vcs_others.sh
    This shows the number of items that are new / un-tracked by the vcs
* new file:   segments/vcs_staged.sh
    These are items that are staged / prepared to be commited into the vcs
* modified:   status-left.sh
    These are set to on by default
Improve vcs_branch printing for git

If browsing a git repository in detached head mode, the branch name used
to say "(No branch)". This is not helpful. Now, it prints a colon and
the abbreviated sha-name that represents the commit you are currently
browsing (i.e. ":303d0sd")
Fix error when not in git repository for vcs_branch
Update README.md
Merge pull request #75 from scicalculator/vcs_greater_detail

Add segments that give greater detail about vcs
Merge pull request #73 from XayOn/master

Debug mode to prevent powerline to dissapear whenever a single segment fails
Undo change. Only have web access atm so I cant to it the right way.
Undo change. Only have web access atm so I cant to it the right way.
Update AUTHORS
Update README.md with debug mode.
The web editor is kind of jumpy. Misplaced that line.
Update weather symbols.
One wave too much.
Add "rain" condition to weather_yahoo.sh

I guess this is the list of possible codes http://developer.yahoo.com/weather/#codes but today I had
<yweather:condition  text="Rain"  code="12"  temp="6"  date="Thu, 01 Nov 2012 3:50 pm CET" />
Merge pull request #76 from kwbr/master

Add "rain" to list of condition codes
Added link to Yahoo API.