mostly adjusted to suggest git fetch instead of git pull
minor GUIDE edits
more clear pledge form and wording, and moved to top above history and
stats
adjusted pledge form further, more clear test message
fixed typo in user summary of pledges
fixed indent error
fixed typo in div syntax
adjusted figures not to be centered when they are within comments
improved ideal model illustration for intro page
finally made snowdrift illustration!
Merge branch 'pledge-form' of github.com:wolftune/snowdrift into wolftune-pledge-form