move sender_id from feature to core
fix #240 add search box and paging in manage sender id
fix route incoming due to changes in sender_id_owner()
typo last commit
update readme
update db
remove option 'send as unicode'
remove unused menu buy credit
replace term 'normal user' with 'user' and update lang
Merge remote-tracking branch 'upstream/master'

Conflicts:
	web/plugin/core/main_config/language/es_VE/LC_MESSAGES/messages.po
	web/plugin/core/themes/language/es_VE/LC_MESSAGES/messages.po
	web/plugin/core/user/language/es_VE/LC_MESSAGES/messages.po
	web/plugin/feature/credit/language/es_VE/LC_MESSAGES/messages.po
	web/plugin/language/es_VE/LC_MESSAGES/messages.mo
	web/plugin/language/es_VE/LC_MESSAGES/messages.po