osx package:  Include uninstall script in zip file.

Don't put it in $PREFIX/bin as before.
Bump version to 1.12.4.2.
Updated changelog.
Fixed 034cd4bb214a30de3739c756eab428d5fbe617cc.

Preserve directory structure for pkg.
EPUB writer:  Fixed regression on cover image.

In 1.12.4 and 1.12.4.2, the cover image would not appear properly,
because the metadata id was not correct.

This was introduced by the fix to #1254.

Now we derive the id from the actual cover image filename,
which we preserve rather than using "cover-image."
Require highlighting-kate 0.5.8.1.

0.5.8 has a serious bug that causes error failure with ocaml and fsharp.
Allow scientific 0.3
Merge pull request #1306 from snoyberg/patch-1

Allow scientific 0.3
fixed escape for literal paragraph
travis: Test with ghc 7.8.2 rather than 7.8.1.
Fixed travis build to install alex for GHC 7.8.2.
Merge pull request #1307 from palday/master

fixed escape for literal paragraph
make_osx_package:  Call zip file pandoc-VERSION-osx.zip.

The zip should not be named SOMETHING.pkg.zip, or OSX finder
will extract it into a folder named SOMETHING.pkg, which it
will interpret as a defective package.

Closes #1308.
Windows build script:  add -windows to file name.
Org reader: support for inline LaTeX

Inline LaTeX is now accepted and parsed by the org-mode reader.  Both,
math symbols (like \tau) and LaTeX commands (like \cite{Coffee}), can be
used without any further escaping.