Remove obsolete code

As well as some format and comment improvements.
Rename to 'table_body'

https://bugzilla.gnome.org/show_bug.cgi?id=720886
Use jQuery like the rest

https://bugzilla.gnome.org/show_bug.cgi?id=720886
Close '<tr>' tag properly

https://bugzilla.gnome.org/show_bug.cgi?id=720886
Use '<span>' instead '<div>'

https://bugzilla.gnome.org/show_bug.cgi?id=720886
Rename 'filepath' to 'file_path'

https://bugzilla.gnome.org/show_bug.cgi?id=720886
Rename 'table_body' to 'file_body'

https://bugzilla.gnome.org/show_bug.cgi?id=720886
Rename 'stats' to 'file_stats'

https://bugzilla.gnome.org/show_bug.cgi?id=720886
Rename 'hunkheader' to 'hunk_header'

https://bugzilla.gnome.org/show_bug.cgi?id=720886
Use 'hunk_stats' as class name

https://bugzilla.gnome.org/show_bug.cgi?id=720886
Apply 'pre-wrap' only on code

Now, we can indent the html elements in normal '<td>'.

https://bugzilla.gnome.org/show_bug.cgi?id=720886
Remove these obsolete css styles

https://bugzilla.gnome.org/show_bug.cgi?id=720886
Should've been done in commit 312cc37

https://bugzilla.gnome.org/show_bug.cgi?id=720886
Keep CSS selector naming consistency

https://bugzilla.gnome.org/show_bug.cgi?id=720886
Move expander '<span>' to template

https://bugzilla.gnome.org/show_bug.cgi?id=720886
Reduce duplicate stage button code

https://bugzilla.gnome.org/show_bug.cgi?id=720886