Added milli->pico versions of Farads and Siemens and kilo->Mega of ohms.
Also added 'Ohm' alias for 'ohm'.
added Eclipse project settings to git ignore
added aliases to kOhm and MOhm
Added k-G liter units, plus British-English spelling aliases for all
"litre" units
added ml, kl, Ml and Gl aliases to litre units
Added molar concentrations
corrected volume and concentration aliases
Added concentration module to units
cleaned up units/concentration.py by adding trailing newline and unicode
symbol to micromolar, and removing redundant aliases
Merge pull request #70 from tclose/added_new_units

Added new units