Clean up code a bit

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

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

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

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

https://bugzilla.gnome.org/show_bug.cgi?id=720886
Change to much suitable 'hunk_stats'

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
Document the usage of each code block

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

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

https://bugzilla.gnome.org/show_bug.cgi?id=720886
Follow css selector convention

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Put related styles together

https://bugzilla.gnome.org/show_bug.cgi?id=720886
Tidy the css styles a bit

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
Extract to 'exec_template' function

https://bugzilla.gnome.org/show_bug.cgi?id=720886
Extract to 'diff_hunk()' function

https://bugzilla.gnome.org/show_bug.cgi?id=720886
Move the wrapped html into template

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