add/substitute .gitignore rules for ignoring _all_ data/*.psydat and …

…data/*.csv files in _any_ subdirectory of demos/. for details, see https://git-scm.com/docs/gitignore#_pattern_format

.gitignore

@@ -70,12 +70,11 @@ psychopy1
 psychojs.zip
 
 psychopy/demos/coder/misc/frame*
-psychopy/demos/*.psydat
-#psychopy/demos/*/*/*.csv
+psychopy/demos/**/data/*.psydat
+psychopy/demos/**/data/*.csv
 psychopy/*/*/*/data/*.xlsx
 psychopy/*/*/*/data/*.psydat
 psychopy/demos/*/*/*.pickle
-psychopy/demos/*/*/*.psydat
 psychopy/demos/*/*/html
 
 psychopy/tests/*Out.*
@@ -86,7 +85,7 @@ psychopy/tests/*htmlcov*
 docs/source/changelog.rst
 docs/source/changelog.md
 # alert 4-digit codes autogenerated
-docs/source/alerts/[0-9][0-9][0-9][0-9].rst 
+docs/source/alerts/[0-9][0-9][0-9][0-9].rst
 
 /iohub_docs/*.bat
 /iohub_docs/*.txt