Add commands for sagetex.
Autoload var alias.
Modified :type keyword of sage-shell:sage-executable.
Fixed sage-shell:sage-executable
Fixed sage-shell-sagetex:run-latex-and-load-current-file.
Added sage-shell-sagetex:load-current-file.
fixed sage-shell-sagetex:-load-current-file.
Modified sage-shell-sagetex:load-file.
No properties in history element.
Fixed sage-shell-edit:process-alist.
Update deferred version.
Fixed the doc of sage-shell-sagetex:pre-latex-command.
Merge branch 'alpha'

Conflicts:
	sage-shell-mode.el