gitignore: Add list of files to ignore.

All of these files are generated by autotools or by the compilation and they
do not belong in a version control.

Signed-off-by: Rogério Brito <rbrito@ime.usp.br>
Merge pull request #7 from rbrito/misc-fixes

gitignore: Add list of files to ignore.
fix gcc warnings
add manpage
update git2changelog to accept non-ascii output
update ChangeLog
Update README -> README.md, generate groff manpage from README.md
rename README.md -> README
fix README
fix to use libFDKAAC signaling mode 1

It turned out that mode 1 is explicit, backward compatible signaling.
We don't have to implement it on our side.
bump version
update ChangeLog
add genman.sh, update fdkaac.1