updated package requirements and travis config
Merge pull request #21 from wildart/dev

updated package requirements and travis config
Added out_path option, fixes #20
Updated README, made Gadfly default for plots
Added command line script for weaving: bin/weave.jl. Closes #19
Keeping track of changes
Implemented asciidoc formatter, closes #16
AsciiDoc formatter to release notes
disable figure processing for no-eval chunks
added code extraction into an Julia source file
Merge pull request #23 from wildart/tangle

Code extraction into an Julia source file
Merge pull request #22 from wildart/dev

disable figure processing for no-eval chunks