update manual for new arrow color lenses
add lw to example, now that ambient line width affects the shaft

See diagrams/diagrams-lib@35e58284.
spruced up gallery
quasifuchsian color changes
try deploying after successful build
add 'safe' as EXTRA_DEP
vector tutorial: remove one more occurrence of 'e'
travis: get eniac's ssh key first before doing rsync
comment out after_success deploy for now

Not working (latest problem is that specifying a password to rsync via
environment variable or file only works if you are connecting to a
remote rsync daemon), and not worth spending more time on at the
moment.
web/Site.hs: cleanup imports
no need to test building the documentation on GHC < 7.6
work on trails+paths tutorial
IRC logs [ci skip]
Merge pull request #41 from diagrams/arrow-attr-lenses

Updates to user manual and arrow tutorial for new arrow color lenses and other changes
clarify Transformable (Located a) instance
first draft of trail + path tutorial.

Probably needs to be fleshed out a bit more, more exercises, etc.
Merge branch 'master' of github.com:diagrams/diagrams-doc
Merge pull request #42 from diagrams/color

Color
travis: turn off multithreading

It seemed to be causing strange problems with Shake.
try moving runWeb action to the end

Not sure if it makes a difference.