Fix eigvals for integer matrices. Define copy! and similar methods for Symmetric and Hermitian matrices.
Merge pull request #4738 from JuliaLang/anj/inteigvals

Fix eigvals for integer matrices. Define copy! and similar methods for Symmetric and Hermitian matrices.
work around varying GMP behavior in gcdx

fix error cases of invmod, particularly the GMP version
Merge branch 'master' of github.com:JuliaLang/julia
Merge branch 'master' of github.com:JuliaLang/julia into jb/gcdfailure