Fix warning that NSEC_PER_SEC is defined on OS X
Compile error on OS X - missing bracket
Improve wording of AC_DEFINEs in configure.ac
Use AS_CASE instead of case/esac
Use tabs instead of whitespaces in configure.ac

Additionally, do not use line breaks in AS_HELP_STRING, AC_MSG_ERROR, or
AC_MSG_WARN macros since m4 cannot handle trailing whitespace properly.
Clock_gettime implementation for OS X

OS X does not have clock_gettime, use clock_get_time instead.
Non-recursive automake

According www.flameeyes.eu/autotools-mythbuster/automake/nonrecursive.html
non-recursive make files have several advantages over the recursive
'classic' version. One advantage is that it exists only a single Makefile.am
to edit, and a single Makefile.in to be processed during ./configure
mrproper make target

Pre-existing make *clean targets are not suitable to delete all generated
files by 'autoreconf -i'. mrproper will clean up all those files.
Require at least automake v1.10
Update travis.linux.install.deps.sh
Merge pull request #121 from alexander-zimmermann/next

Autotools stuff & OS X support
* fixed bug in vasprintf_append() causing the input string to stay unchanged
* fixed possible memleak in vasprintf_append() in case realloc fails
Merge pull request #124 from MarcelNehring/fg_string

Fixed bugs in vasprintf_append()
Added checks to ensure provided directory for dump files is valid and correctly formatted, defaults to CWD if not provided
fixed possible crash in case dump thread is canceled and cleanup function is called twice
fixed possible crash in case dump thread is canceled and remove_flow() is called before dump thread actually terminated
fixed that uninit_flow() invalidates all existing pointers to flows following the one in question
[Code Style] Added comments to option struct
Added ap_free call to end of programs and made arg parser static in controller+daemon.

This makes sure the arg parser lives as long as the program.
[Code Style] Added comments to parsing functions + Adapted function headers
Added function ap_is_used to check if option was specified on cmdline.
Added macro for unified parsing error messages.