Add series element width function for sizing candlestick/ohlc bars.

Conflicts:
	components/series/candlestick.js
Removed the hard-coded margin from  domainFromValue

Also renamed the filenames for the dateTime and linear scales to match the name of the objects they produce
Merge pull request #167 from tlsim/seriesElementWidth

Add series element width function for sizing candlestick/ohlc bars.
Merge pull request #168 from ColinEberhardt/remove-hardcoded-margin

Removed the hard-coded margin from  domainFromValue
Revert "Add series element width function for sizing candlestick/ohlc bars."
Merge pull request #170 from ScottLogic/revert-167-seriesElementWidth

Revert "Add series element width function for sizing candlestick/ohlc ba...