delete escape character and [improving] CI performance

Use normal! instead of normal.

.travis.yml

@@ -1,4 +1,5 @@
-language: vim
+language: generic
+sudo: false
 
 cache:
   directories:

test/airline-themes.vader

@@ -15,15 +15,15 @@ Execute (validate themes):
       Log theme
       execute('AirlineTheme ' . theme)
       execute('source ' . themePath)
-      normal i
-      normal :
-      normal R
-      normal v
+      normal! i
+      normal! :
+      normal! R
+      normal! v
       setlocal mod
-      normal i
-      normal :
-      normal R
-      normal v
+      normal! i
+      normal! :
+      normal! R
+      normal! v
       setlocal nomod
 
     endfor