Merge pull request #16 from mlund/master

Update 03.11.2014
Merge pull request #17 from mlund/master

Fixed tiny bug due to unassigned variable.
Merge pull request #61 from LukasSukenik/master

GrandCanonical fix
Merge pull request #62 from LukasSukenik/master

Inserter implementation, activity Fix
Updated playground.
Merge pull request #18 from mlund/master

Update.
Updated playground.
Minor bug in one of my programs.
Added new analysis to one of my programs.
Fixed salt particle addition assertion when inserting zero particles
in empty particle vector
Last changes to Stephanie's program.
Merge pull request #63 from jmhenriques/master

Big update in my playground.
Fixed Space::load/save to work with grand canonical systems.
Prettified state file output so that groups and particles appear on a
single line; indentation in space
cmake header file addition (for clion); source code formatting
Added ewald summation energy -- tested in water2 variant.
Still need testing and refinements
Ewald update
Added tracker class template for tracking molecules and atoms
doc update
Random twister default; random element picker for stl containers;
removed water example (only water2 left); prep for GCMC
molid and molsize streaming IO added to group; updated tests state
files.