Rename 'data' into 'imageData'

As agreed on NIDASH-DDWG call 10/02/2014.
Proposed 'image data' modelling

As discussed on March 26th
Rebasing
Remove brain from attribute names

`targetBrainIntensity` becomes `targetIntensity` and
`measuredMedianBrainIntensity` becomes `medianIntensity`
`Image data` updated to `data`
Update bold font

change `**` to `<b>` HTML tag as the former is not properly displaying bold for part of the words.
Rename 'data' into 'imageData'

As agreed on NIDASH-DDWG call 10/02/2014.
Proposed 'image data' modelling

As discussed on March 26th
Remove brain from attribute names

`targetBrainIntensity` becomes `targetIntensity` and
`measuredMedianBrainIntensity` becomes `medianIntensity`
`Image data` updated to `data`
Capitalise "prov:Collection"
Update serialisations
Remove "image" from data label
Update serialisations
add: initial mapping of cff to provn
rf: containers refer to metadata about binary objects
add: original cff example
fix: remove comments causing cnversion to fail
Merge pull request #42 from nicholsn/enh/cff

Initial attempt at mapping CFF to PROV-N
Fixed: nidm tags to cml