Implementation of improvements proposed by Aaron

Static array created to hold a list of all atoms.
SigmaValues are stored in an array instead of a dictionary.
No use of GetComponent or FindObjectWithTags.
Bond drawing uses the static list of molecules
Timestep changed to 3.0 femto sec.

This increased time step help improving frame per second up to 10 for
70 molecules in the scene.
Object naming improved.
force adjustment coefficient calculated in a table

The force adjustment coefficient which used to be calculated in every
time step is calculated all at once and looked up from a table.
Debug of last commit.
Forces are now calculated at once

CalculateForce.cs is added and the forces are calculated and applied to
the atoms at once in this file.
New method for reflecting atoms from the walls

A new method is used for reflecting atoms from the walls added.
Initial position of newly added atoms are randomized.
Debug for unstability after changing the volume

A slow motion phase has been added so that the atoms have some time to
stabilize after changing the volume.
Updated default iOS build settings to match provisioning profiles
Kelvin to Celsius conversion fixed
Bug fixes

Counter for total number of MD simulation added.
Bug fix regarding moving the atoms
Merge remote-tracking branch 'origin/buckinghamPotential'

Conflicts:
	Assets/Scripts/Atom.cs
	ProjectSettings/QualitySettings.asset
	ProjectSettings/TimeManager.asset