Containerize with docker
Merge pull request #93 from scrapinghub/dockerize

Containerize with docker
maxrss can be set based on ratio of total physical mem
Merge pull request #95 from scrapinghub/percent-maxrss

support percent of total mem for maxrss check
add docs/_build to .gitignore
DOC document 'js' and 'X-Splash-js' parameters; add more links to the docs.
DOC fixed example formatting
DOC fix curl examples. See GH-72
DOC document Splash ports. See GH-26.
DOC additional references in docs
Merge pull request #4 from scrapinghub/master

latest from upstream