Small improvements

Redeclare Blue colour used to display virtualenv name: the color didn't
work in git repositories.

Removed ResetColor local: has no effect as ResetColor is already global
and we don't change it here.

gitprompt.sh

@@ -177,11 +177,11 @@ function updatePrompt() {
   local PROMPT_START
   local PROMPT_END
   local EMPTY_PROMPT
-  local ResetColor
-  local Blue
   local GIT_PROMPT_FETCH_TIMEOUT
   local __GIT_STATUS_CMD
 
+  local Blue="\[\033[0;34m\]"
+
   git_prompt_config
 
   local -a GitStatus