add prepend!. closes #1854
Update the linalg documentation
Linear algebra documentation has its own file.
Make linalg docs come out right in the manual (rst tweaking)
Update index.
Some renamings for consistency as discussed in #2593.

Eigen -> EigenDense
eigenfact -> eigfact
Hessenberg -> HessenbergDense

Includes doc updates for linalg as well.
Separate sparse matrix documentation into a separate file.
Add sparse.rst, which I forgot to add in the last commit.
Allow overriding LLVM Targets
Avoid using bool() in the call to nnz.
bool(Complex) gives InexactError, which causes a whole bunch of stuff to break
Also add a test for sparse complex matrix construction.
Merge branch 'master' of github.com:JuliaLang/julia
Some updates to the laplace benchmark.
Remove old median example.
correct sprintf/printf doc
Merge pull request #2599 from ihnorton/master

doc correction: sprintf/printf
Include documentation on sparse factorizations.

Also some housekeeping changes.
Fix imports from LinAlg, not Base
fix typo
Merge pull request #2604 from WestleyArgentum/patch-1

fix typo