Added max_dpi option for save(), and now do auto-dpi for pdf files too
Added max_dpi option for save(), and now do auto-dpi for pdf files too

git-svn-id: 83a0274dba4329d458142e4079227af35a786d9d@225 2f3f69f2-b874-4715-96d5-35985bcb53a6

allisony/aplpy,mwcraig/aplpy