Bug fix: Track name can be '0' at times

The code ignored the tracks if their id is false
Redirect vep download link from mirrors to www
Added data file formats to allowed file types (obscure Apache bug)
Provide compara objects to the plugin override method
Merge pull request #35 from nicklangridge/release/75

Provide compara objects to the _counts plugin override method
Typo in URL
Helptip added to Checklist labels
Improvements to selectToToggle

Can now accept multiple classes starting with _stt__ to define multiple selectors to show/hide
Class name can be a string or an arrayref
Sprites need to be in webcode for drawing code.
Bug fix: Newline chars get ignored breaking <pre>

Don't ignore the newline characters while returning the final output HTML
While embedding an HTML file, only embed the contents of the <body> tag, not the whole HTML
Clear circular refs to allow object destruction

Remove child nodes from all elements after rendering them to clear circular references, thus allowing object to destroy.
Trackhub 'color' parameter should override our guess at track colour!

Conflicts:

	modules/Bio/EnsEMBL/GlyphSet/bigbed.pm
Bug fix: Tracks with hiphen get ignored in DataHub

Regexp replaced to consider hiphens (and all other charactes except '=') in track name
Temp memcached fix for tools for release 75
Bug fix: Broken markup for transcript similarity

<div> has to be closed despite of $join_links var's value.
Bub fix: adding empty string to int type field

This fails sometimes depending upon mysql confs
Changing upload limit
Bug fix: textarea tag was not closed properly
Fix zMenu location maths for unlucky rounding.