removed buildozer; made gitignore more robust

.buildozer

-/home/cse/.buildozer_share
\ No newline at end of file

.gitignore

+# Mac file finder metadata
+.DS_Store
+# Windows file metadata
+._*
+# Thumbnail image caches
+Thumbs.db
+ethumbs.db
+# MS Office temporary file
+~*
+# Emacs backup file
+*~
+
+# Common
+bin
+
+# Python files
 *.pyc
 *.pyo
-*.json
+__pycache__/
+
+# JetBrains (IntelliJ IDEA, PyCharm, etc) files
+.idea/
+cmake-build-*/
+*.iml
+*.iws
+*.ipr
+venv/
 
-.idea
-bin