v0.27 - Pre-release

ImzML Writer
This is the first pre-release of imzML_Writer integrating several major upgrades/changes to distribution and functionality:
-distributable package available on pypi (pip install imzML-Writer)
-Standalone executables available for download

Upgrades:
-Documentation available on ReadTheDocs (https://readthedocs.org/projects/imzml-writer/)
-Cleaned up imzML errors - most files should be error free on the imzML validator (https://imzml.github.io)
-Better colormap picking in imzML scout (GUI selection, persistent saved settings across instances)
-Better handling when msconvert isn't added to path on PC - support for GUI/auto search for msconvert.exe, saves path for future use
-Advanced options for imzML Writing including support for:
1. No duplicated pixels in sparsely sampled regions (default behaviour duplicates, but flags with a UserParam in duplicated spectra)
2. 0- vs. 1-indexed coordinate systems
3. Custom lock mass search tolerance

• Support for usage from command-line interface (see documentation)