Closes #394.
Merge pull request #395 from standage/interfeat

Closes #394.
add devguide paragraph on testing
don't show default for seed
typos
Merge pull request #397 from Garonenur/dw

add info in devguide, run make docs
gtlua: add gt.script_path
Merge pull request #399 from satta/luapath

gtlua: add gt.script_path
gtlua: add FeatureNode:get_phase()
Merge pull request #400 from satta/getphase

gtlua: add FeatureNode:get_phase()
add probabalistic filters
add test for sampling
Merge pull request #401 from Garonenur/dw

this PR adds some filters to the seqfilter tool
fix double free bug

Addresses #340.
Merge pull request #402 from satta/segfault

fix double free bug
comments on obscure ref/del cycle
typos
complete documentation of new Lua node API
update documentation
Merge pull request #403 from satta/cosmetics

Cosmetics and documentation