Refactored axis tick code into utility function
Debugging new implementation
Make Compnents Read-only

Closes #212
more debugging
cleanup
Added Categorical data to the histogram_client
Refactored axis tick code into utility function
Added Categorical data to the histogram_client
Fix a bug introduced in #231 that added extra patches to the graph
Catch a key error
Data.get_component accepts strings

Closes #239
LoadLog uses absolute paths

Closes #237
Undo/redo menu items are given labels

Closes #236
Restore 'drag to plot' canvas text
Merge branch 'factor-update-ticks' of github.com:JudoWill/glue into factor-update-ticks
Merge pull request #241 from ChrisBeaumont/fixes

Fixes
Fixed high-cardinality issues with categorical histograms and failing test.
Number of bins should be 'over-ridable' by the UI widget.
Fixed binning logic for categorical histogram when combined with UI
tweak bin alignment