1. Fixed a bug that prevented highlighting when more lines were deleted
from a replacement block than added
2. Added similarity search feature to match similar lines for
highlighting.
3. Highlighting: Support for matching "ins" and "del" markers to allow
for a "change" marker
4. Bugfix: All lines are now split into prefix and content spans
Use <table> element to lay out the file summary. The summary is tabular
data anyway so the use of <table> should be justified. First column
contains lines added, justified to right and the second column contains
lines removed, justified to the left. The last column has the file name.
Fixes#27
