Do not convert to date using line + linear x-scale

This was an old remnant from before we had `dataFormatX` that probably should have been removed long ago.

fixes gh-7
Automate setting version number on js and docs

Use:
* make build
* make docs OR make test-docs

closes gh-8
add changelog, update version number
fix docs/css missing dir
added options and test for axis min/max values
setData allows setting x/y Min/Max onto options
add documentation for x/y Min/Max
do not extend time scales (massive failure)
Merge pull request #10 from tenXer/feature/axis-min-max

Feature: optional axis min and max values
version bump 0.1.3
update docs version number