Add new plugin: "frontend-search"
Merge pull request #2892 from willmendesneto/dev

Add new plugin: "frontend-search"
Change history alias into a function

This commit changes the history alias into a function which puts
the passed arguments before `-l 1`. It also provides a temporary
workaround to the lack of a `history -c` command in zsh.
This resolves #739 and resolves #789.