Svviz

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- no longer requires X11 if rpy2 is installed (I know, this was a weird one)

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- code refactoring and new tests that should make it easier to modify and improve the visualizations produced by svviz
- added experimental support for webkitToPDF, a command-line tool that uses OS X's built-in SVG support (part of Safari's webpage rendering code) to convert SVGs to PDFs; this currently requires a separate install of webkitToPDF. webkitToPDF produces much better PDFs than rsvg-convert does (for example, fonts are converted properly)

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- added link to preprint on bioRxiv
- added support for exporting one pdf per event in batch mode
- tweaks and fixes for visualizations
- changed coloring of insertions in reads to cyan

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- filter out reads that align multiple times within the region of the structural variant ("multimapping")
- many minor bug-fixes and interface tweaks

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- demo data now gets downloaded from Stanford webspace
- added ``--version`` command line option
- no longer fails if pandas is an older version
- check for librsvg before we do the analysis

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- fixed bug that prevented ``--export`` option from working
- ref and alt alignment scores must differ by at least 2 in order to assign a read to an allele by alignmentScore
- minor bug fixes