Check for matplotlib if coverage argument was defined before fonts loop
rename --coverage to --show-hilbert cli argument

output folder for generated png has format YYYY-mm-dd-HHMMSS
generate_coverage -> show_hilbert
CLDR interface
For CLDR raising error if ICU package is not installed
simplify interface for CLDR using pyicu package
Update README.md
Update README.md
Extension that requires some packages to be installed now raises PackageRequiredException
Merge branch 'master' of github.com:davelab6/pyfontaine
Print warning message to sys.stderr about required package
Move README back to RST for pypi page
Merge branch 'master' of github.com:davelab6/pyfontaine
README: Add PyICU to deps list
Update README.rst
Update setup.py
removed notices about requirements.txt

All  required packages defined in setup/py
merged md and rst versino of README
Append encodings collections