Make sure TARGET is set correctly when CURDIR contains spaces.

With this fix the `TARGET` variable is set correctly when the project directory
(or its path) contains spaces. So in this case:

    /Users/Joe/Dropbox (Personal)/example project

`TARGET` will be set to `example_project` instead of `Dropbox example project`
(like it was before this fix).

1 files changed, 3 insertions, 1 deletions

diff --git a/Arduino.mk b/Arduino.mk
index ba16697..43e1bb8 100644
--- a/Arduino.mk
+++ b/Arduino.mk
@@ -266,7 +266,9 @@ endif
 # Default TARGET to pwd (ex Daniele Vergini)
 
 ifndef TARGET
-    TARGET  = $(notdir $(CURDIR))
+    space :=
+    space +=
+    TARGET = $(notdir $(subst $(space),_,$(CURDIR)))
 endif
 
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