Skip ReSpeaker driver if already exist (#372)

.gitignore

@@ -1,5 +1,6 @@
 
 .idea/
+.vscode
 .response
 extras/cmu_us_slt.flitevox
 requirements.txt

install.sh

@@ -21,10 +21,15 @@ install_debian_dependencies()
     # TODO: Replace mpv with something else which doesn't pull video-related stuff.
 }
 
-function install_seed_voicecard_driver()
+function install_seeed_voicecard_driver()
 {
     # TODO: Modify this driver install script, so that it won't pull libasound-plugins,
     # which in turn, pull lot of video-related stuff.
+    if arecord -l | grep -q voicecard
+    then
+        echo "ReSpeaker Mic Array driver was already installed."
+        return 0
+    fi
     echo "installing Respeaker Mic Array drivers from source"
     git clone https://github.com/respeaker/seeed-voicecard.git
     cd seeed-voicecard
@@ -36,7 +41,7 @@ function install_seed_voicecard_driver()
 
 function install_dependencies()
 {
-    install_seed_voicecard_driver
+    install_seeed_voicecard_driver
 }
 
 function install_susi_server() {