* Added sanity checks for `BNS_CUSTOM_*` define statements
* Added `_x` i18n implementation to `show` and `hide` default messages
* Replaced `BNS_Inline_Asides::replace_spaces` with `sanitize_html_class` functionality
* Renamed `BNSIA_Scripts_and_Styles` to `scripts_and_styles`
* Updated `readme.txt` to note additional default types of asides

git-svn-id: https://plugins.svn.wordpress.org/bns-inline-asides/trunk@1022202 b8457f37-d9ea-0310-8a92-e5e31aec5664