Override transData before setting WCS
added methods to set frame linewidth and color
moved methods to coordinates_map from coordinate_helpers
fixed typo
moved docstrings to frame.py, added test
sigh had forgotten to add the updated test_images file
removed methods completely from coordinates_map
Merge pull request #88 from anizami/frame-settings

Added methods to set frame linewidth and color
minor ticks work now, haven't test them extensively yet
edited getters and setters
added docstrings
added minor_locator to ScalarFormatterLocator
fixed typo
refactored the code for finding major and minor ticks positions
refactored code for drawing major and minor ticks
changed minor_locator so it doesn't have major ticks anymore, refactored computing ticks code again
cleanup
added option to set separators for angle coordinates
moved minor_locator to BaseFormatterLocator
added unit tests