Many fix bug/notice/warning

*This pull is only for fix bug/notice/warning from Circa75:master. Nothing have been add, there is just correction of code.*

Hi !

I've set $display_errors to true and try to resolve all errors.
All php message on page index, post and category are resolve.

There was a bug with load the twitter profile image (commit 8a71bf5 and 95a5bfd ) 

I also fix a bug from the issues tab : 
- #185 Post titles containing " quotes escape the page meta (commit 980ff8b )