Update .gitignore

Remove /doc folder, which has been removed from the repo.

Merge pull request JuliaDSP#221 from wherrera10/master

Fixes for 0.7 and 1.0. Thanks @mokus0 and @wherrera10!

Fix a few deprecations on Julia 0.7 (JuliaDSP#207)

* Use `eigen` and `eigen!` on newer Julia

* Use single-argument `eval`

* Replace `atan2` with two-argument `atan`

Bump minimum required Julia version to 0.6 (JuliaDSP#194)

METADATA does not allow `julia 0.6-rc1` anymore.

Fix FFTW related warning on Julia 0.6 (JuliaDSP#179)

Avoid `using FFTW` on Julia 0.6, as the FFTW package does not define a
module there, leading a warning about failed precompilation.

Fix exports of functions removed from Base in 0.7.0-DEV.602 (JuliaDSP…

…#175)

Fix Base function overloading (JuliaDSP#164)

Make the FFTW importing VERSION bound more specific (JuliaDSP#163)

Temporarily bump the FFTW importing check on VERSION to >=1.0.0 (Juli…

…aDSP#162)

Requirement fixes