Test for access to undefined error from splice!
Use deleteat! instead of splice! in linalg/sparse

If the array type is such that elements are initially allocated as #undef, then splice! will fail to remove the extra space since it returns the values, giving error: access to undefined reference.
Merge branch 'sparse-deleteat' of github.com:tkelman/julia into tkelman-sparse-deleteat

Conflicts:
	test/sparse.jl