Add autoclose plugin to handle autoclose for brackets, quotes etc...

The plugin adds an option `autoclose` to configure whether or not you
would like quotes, brackets etc... to be automatically closed. The
option is enabled by default.

Closes #176

cmd/micro/micro.go

@@ -248,6 +248,7 @@ func main() {
 	L.SetGlobal("BindKey", luar.New(L, BindKey))
 	L.SetGlobal("MakeCommand", luar.New(L, MakeCommand))
 	L.SetGlobal("CurView", luar.New(L, CurView))
+	L.SetGlobal("IsWordChar", luar.New(L, IsWordChar))
 
 	L.SetGlobal("JobStart", luar.New(L, JobStart))
 	L.SetGlobal("JobSend", luar.New(L, JobSend))

cmd/micro/plugin.go

@@ -14,6 +14,7 @@ var loadedPlugins []string
 var preInstalledPlugins = []string{
 	"go",
 	"linter",
+	"autoclose",
 }
 
 // Call calls the lua function 'function'