Upgrade to pegJS 0.8

[sethkinast]

Featuring an approximately 90% reduction in template compile time. Zomg-we're-faster-than-Handlebars. All tests pass. Node 0.8 compatible.

pegjs-0.7$ time bin/dustc ~/Desktop/syntax.md.txt > /dev/null

real    0m1.119s
user    0m1.100s
sys 0m0.024s

pegjs-0.8$ time bin/dustc ~/Desktop/syntax.md.txt > /dev/null

real    0m0.114s
user    0m0.096s
sys 0m0.017s

Upstream changes that affect us:

• line and column variables are now functions
• parser.toSource() removed in favor of a generator option that switches between an object and string versions

[sethkinast]

@ctotheameron this is relevant to your interests when it goes in.

[kate2753]

Nice! This looks good to me!

[shakyShane]

Mind-blowingly awesome if this lands.

[jimmyhchan]

Awesome. Looks backcompatible everywhere. let's patch this to 2.4 2.3 and 2.2

Thanks!

[sethkinast]

Added backcompat patch branches and merged them into the feature branch.

We'll still need to npm publish, but it's as easy as checking out the proper tag.

[sethkinast]

As per discussion today, threw out the 2.2 backcompat and left only 2.3.