Stable 2.1.0

Updated LAMMPS to 11Aug17 stable release

Catch variable command errors as other errors are being caught (Issue #346)
Using OpenGL in figures for improved performance
Added --clearcache argument
Added statistics sampler to measure Atomify usage
Added ctrl +/ctrl - to increase/decrease font size. (Issue #339)
Added export to text/Python/Matlab for compute and variable plots
Added plotting controls to varibles
Added modifyable atom types file. (Issue #356)
Right column is prettier with documentation and number formatting
Periodic imgs work with hidden atoms (Issue #351)
Can resize list of files panel
Added cpuRemain and timestepsPerSecond to simulation summary
Added more packages to default lammps installation
Updated to Quick Controls 2.2
Added support for running regular LAMMPS from atomify terminal