added wav parsing, with SpeechRecognition

Signed-off-by: Arvind Chembarpu <achembarpu@gmail.com>
added .wav test file

Signed-off-by: Arvind Chembarpu <achembarpu@gmail.com>
force python2 compat versions only

Signed-off-by: Arvind Chembarpu <achembarpu@gmail.com>
added improved wav test file

Signed-off-by: Arvind Chembarpu <achembarpu@gmail.com>
added wav test case to testing script

Signed-off-by: Arvind Chembarpu <achembarpu@gmail.com>
adde wav file support to index

Signed-off-by: Arvind Chembarpu <achembarpu@gmail.com>
added contribution to changelog

Signed-off-by: Arvind Chembarpu <achembarpu@gmail.com>
changed default text for audio extraction
removes ambiguity

Signed-off-by: Arvind Chembarpu <achembarpu@gmail.com>