Scour

* added `--keep-editor-data` command-line option
* Fix [Bug 395645](https://bugs.launchpad.net/scour/+bug/395645): Keep all identified children inside a defs (Thanks Frederik!)
* Fix [Bug 395647](https://bugs.launchpad.net/scour/+bug/395647): Do not remove closepath (Z) path segments

* Collapse adjacent commands of the same type
* Convert straight curves into line commands
* Eliminate last segment in a polygon
* Rework command-line argument parsing
* Fix bug in embedRasters() caused by new command-line parsing
* added `--disable-embed-rasters` command-line option

* properly deal with `fill="url("foo")"`
* properly handle paths with more than 1 pair of coordinates in the first Move command
* remove font/text styles from shape elements (font-weight, font-size, line-height, etc)
* remove -inkscape-font-specification styles
* added `--set-precision` argument to set the number of significant digits (defaults to 5 now)
* collapse consecutive h,v coords/segments that go in the same direction

* upgraded enthought's path parser to handle scientific notation in path coordinates
* convert colors to RRGGBB format
* added option to disable color conversion

* convert gradient stop offsets from percentages to float
* convert gradient stop offsets to integers if possible (0 or 1)
* fix bug in line-to-hv conversion
* handle non-ASCII characters (Unicode)
* remove empty line or curve segments from path
* added option to prevent style-to-xml conversion
* handle compressed svg (svgz) on the input and output
* added total time taken to the report
* Removed XML pretty printing because of [this problem](http://ronrothman.com/public/leftbraned/xml-dom-minidom-toprettyxml-and-silly-whitespace/).

* Remove path with empty d attributes
* Sanitize path data (remove unnecessary whitespace)
* Convert from absolute to relative path data
* Remove trailing zeroes from path data
* Limit to no more than 6 digits of precision
* Remove empty line segments
* Convert lines to horiz/vertical line segments where possible
* Remove some more default styles (`display:none`, `visibility:visible`, `overflow:visible`,
`marker:none`)