Bump version to v0.3

Fix some typos in source, change some logging to match sink

Fix segfault when socket names not given via env #19

snprintf requires malloc before copying strings. I didn't do enough test the case
when socket names were not given via environment variable.

README: sync to the wiki

CentOS 7.5 or later requires pulse modules to be built with distro's RPM
source.

Remove xrdp dependency

and remove CHANSRV, use the shorter name

now this module no longer depends on xrdp headers.

build with distro's pulseaudio source

use config_ac.h for our config.h

as xrdp already uses config_ac.h. To be consistent, let's use
config_ac.h rather than module-config.h.

correct travis badge branch

introduce travis build test

Sync README.md with the wiki

brush up use of autotools

* name bootstrap script bootstrap as well as other xrdp repos
* use pkg-config to get pulseaudio version and module directories
* guess prefix by checking for pulseaudio executable
* simplify message then PULSE_DIR not specified
  as m4_text_box doesn't support multiple lines

add Autotools scripts

update README.md

so our modules will be installed where system's pulseaudio modules are.
Unfortunately, pulseaudio don't check `/usr/local` first

ignore built object and shared object files

Also, remove !Makefile as we are now out of xrdp tree.

Include xrdp_sockets.h directly, not through headers.

Use XRDP_SOCKET_PATH in file_loc.h

Don't define any non-socket paths in file_loc.h, they should come from
the makefiles.

Define all paths unconditionally, they should not be defined elsewhere.

Pass XRDP_SOCKET_PATH as environment variable to the backends.