First commit for unit-testing

- Bundling the 'check' unit test framework. See this as a boot-strap
  step, rather than a library dependency.
Merge pull request #212 from justfalter/add_unit_tests

First commit for unit-testing
Add functionality to spoof negative cache replies
Include examples in etter.dns file and modify instruction section
Add myself to the AUTHORS file
Delete some unessary code
Use available function to translate nstypes to string.
Merge pull request #219 from koeppea/master

dns_spoof plugin: add support for negative-cache replies
Use dedicated etter.mdns file for mdns_spoof plugin to avoid
warnings printed out by mdns_spoof plugin when parsing the etter.dns
file and meets record types not supported by mdns_spoof plugin but
supported by dns_spoof plugin.
fix some typos in etter.dns and etter.mdns
Add POST-data content printing to ec_http

- This comes care of AntonioCollarino
Stop exiting because sslstrip didn't init.
Relocate pcre_compile, change error handling

- Make failures to compile PCRE non-fatal

- Fix likely memory leak caused by calling pcre_compile but never
  pcre_free:
    -Move pcre_compile to sslstrip_init, and make its return global since
     we should only compile the regex once.
    - Ensure that compiled PCRE is freed when plugin is unloaded.
Relocate regcomp, change error handling

- Make failure of regcomp(&find_cookie_re) non-fatal

- Fix another likely memory leak, this time from having called regcomp
  without regfree:
    - Move regcomp to sslstrip_init, making find_cookie_re global
    - Ensure that find_cookie_re is properly freed
Make failure of http_remove_redirect non-fatal
Fixes related to redir_command_*

- Ensure that forked command executed properly by checking exit status
  of process.

- Log command that failed to UI.
Switch to USER_MSG

- INSTANT_USER_MSG causes weird message doubling, for some reason.
Cherry picked barak's commit on ettercap svg icon
Excluding /obj-*/ directories (debian build system)
Merge pull request #222 from koeppea/master

Fix for issue #216 "unknown records"