Molpainter

* Let the user set layer depth to a float, rather than just an int
* Suppress MDAnalysis warnings on loading solute
* More degrees of zoom available

Changes since previous release

* Added more in-depth test for MolPainter that constructs a system and compares it to a reference system (v1.1.4)
* Made **seed** optional in MolSolvator (v1.1.5)
* Slight improvements to documentation (v1.1.5)

* Documentation improvements
* Methods to check version
* Cleaner command line messages and exception handling
* Tests for MolPainter and MolSolvator
* Bugfix for MolSolvator. Was requiring B-factor fields to be set to 1.00 for determining center of geometry when populating the solvent lattice.
* MolSolvator RNG can now accept a seed for reproducibility