Merge pull request #59 from flightaware/ISSUE-58-LT_INIT-delopen

Add README.Linux duplicating README.FreeBSD

bump to 2.4.0

bump version to 2.3.8

Add tclstub support (#23)

* Add tclstub support

Initialize the stubs when needed.

* Bump version

* Add tclstub support

To build with tclstub library run.
You have to autogen.sh to create a fresh configure.

NOCONFIGURE=1 ./autogen.sh
./configure --enable-tclstub

And add any other flags you need.

We ship the configure script to help distro's that do not
run a full autogen.sh. But stubs is only available if you
run autogen.sh (or the automake process).

Rebuild configure

Update version number.

Remove configure from .gitignore and add to repo.

Commit a Linux configure and autotools environment.

increment version to 2.3.2

libtool cannot be missing on Travis-CI