new browserify build

compiled with a more recent version of browserify
test all branches
add option to convert properties to numbers

closes #24
add tests for -e cli option
recursively make stuff numeric in "enhanced properties" mode
Added verbose option that writes diagnostic messages to stderr
verbose should be false by default
Distinguish between multipolygon relation and way ids in verbose output
Merge pull request #27 from vsivsi/verbose-output

Added verbose option that writes diagnostic messages to stderr
Merge branch 'gh-pages' into neogeometries

Conflicts:
	osmtogeojson.js
implement center geometry mode for the json data format
implement center geometry output mode in CLI tool