Merge pull request #17 from xen/master

Check if file on the disk
rename accessed variable `_charmaps` to `charmaps`
Merge branch 'master' of github.com:davelab6/pyfontaine
remove empty character maps from user input
Updating gwf_latin.py charmap to remove duplicate
Update gwf_latin.py charmap to remove duplicate, add PUAs
Update gwf_latin.py
Update gwf_latin.py
Update gwf_latin.py charmap to inc nbsp
Adding chars found in latin-ext subsets
Update Extensis to 1.19
Merge branch 'master' of github.com:davelab6/pyfontaine
Update setup.py
Director get new argument to filter in print character sets
that do not have missing values.
Update README.rst
Rewrite creating class by using type()
Include Extensis parent glyphs
Update INSTALL.md
Update INSTALL.md
When --missing argument passed print only list of unicode values