Compile lock minor change 

Import and doc.

Document confusing argument in theano.clone

Epd mac

I still allow the vm and vm_nogc linker, but I'm not sure the current version will work, but we can fix it.

Make cvm the default

Doc

removed broken :wiki: links

added a README to the benchmark directory

Update the GC in CVM to match what is done for VM.

Remove Value

a few small stuff Small

    Bool value, default: False

    If True, will print compilation warning.

refine the logic of importing the cutils_ext, in response to a bug reported to theano-dev by usaar33 on June 29, 2012.

fixed gradient name bug

I think the insert will always succeed, but just in case.