First release

Created functions:

• string_camelcase_dash;
• string_camelcase_separator;
• string_camelcase_underscore;
• string_dash_camelcase;
• string_lower;
• string_repeat;
• string_replace;
• string_replace_all;
• string_scape;
• string_separator_camelcase;
• string_title;
• string_underscore_camelcase;
• string_upper.