eigs fixes: input preprocessing, eigvecs postprocessing, tests and doc

eigs: further fix and cleanup

eigs: final fixes, test and doc update

eigs: final fix?
vec for sparse matrices & sparsevec from matrices
Update documentation of sleep to note minimum sleep time
Bump libuv version for win32 changes
Give a little love to doc/Makefile's cleaning rules.  Also change the \` characters to ' to play nicely with syntax highlighting
Merge pull request #7668 from quinnj/master

Update documentation of sleep to note minimum sleep time
Two LLVM 3.5 fixes

- Add forgotten prepare call. Fixes dcjones/Gadfly.jl#368
- Remove an unused variable to silence compiler warning
Bump LLDB version and make customizable
Merge pull request #7666 from tanmaykm/spmatrix

vec for sparse matrices & sparsevec from matrices
Merge pull request #7622 from Jutho/jh/eigsfix

WIP: fixing eigs