Feature speakers veiw 15

https://github.com/Luukyb/DrupalcampCebu2014/issues/15

Updated views for speakers and renamed a few features for uniformity.
- config_environment_indicator_feature -> config_environment_indicator
- views_speakers_views_feature -> views_speakers
- media_image_styles_feature -> media_image_styles

Please also note that the speaker name has no style, same with the original views. I am afraid to touch the css, because it looks like the sass files are not updated.