[FIX] Packaging: MANIFEST.in: include relevant files

As opposed to before, the source package includes requirements.txt,
LICENCE and the README.md. Note: avoiding to chip openerp.egg-info
leads to weird issues so let's just keep it at the moment.

MANIFEST.in

-recursive-include * *.css
-recursive-include * *.csv
-recursive-include * *.gif
-recursive-include * *.html
-recursive-include * *.jpeg
-recursive-include * *.jpg
-recursive-include * *.js
-recursive-include * *.md
-recursive-include * *.png
-recursive-include * *.po
-recursive-include * *.rml
-recursive-include * *.rng
-recursive-include * *.rst
-recursive-include * *.sass
-recursive-include * *.sql
-recursive-include * *.txt
-recursive-include * *.ttf
-recursive-include * *.woff
-recursive-include * *.xsl
-recursive-include * *.xml
-recursive-include * *.yml
+include requirements.txt
+include LICENSE
+include README.md
+recursive-include openerp *.css
+recursive-include openerp *.csv
+recursive-include openerp *.gif
+recursive-include openerp *.html
+recursive-include openerp *.jpeg
+recursive-include openerp *.jpg
+recursive-include openerp *.js
+recursive-include openerp *.md
+recursive-include openerp *.png
+recursive-include openerp *.po
+recursive-include openerp *.rml
+recursive-include openerp *.rng
+recursive-include openerp *.rst
+recursive-include openerp *.sass
+recursive-include openerp *.sql
+recursive-include openerp *.txt
+recursive-include openerp *.ttf
+recursive-include openerp *.woff
+recursive-include openerp *.xsl
+recursive-include openerp *.xml
+recursive-include openerp *.yml
 recursive-exclude * *.py[co]
\ No newline at end of file