Merge pull request #1 from codecurve/master

Added note on relationship between CellML specification and libCellML development.
Fixing the list formatting.
Changes to the roadmap specifically Milestone 0.  The changes are to clarify the work required to complete all the tasks within the milestone and set the timeframe for delivery.
Correct my bad english and set a date for Milestone 0 completion.
Merge pull request #4 from hsorby/master

Changes to the roadmap specifically Milestone 0.