'app' module renamed to 'lib'.

--HG--
rename : app/.gitignore => lib/.gitignore
rename : app/build.gradle => lib/build.gradle
rename : app/proguard-rules.pro => lib/proguard-rules.pro
rename : app/src/main/AndroidManifest.xml => lib/src/main/AndroidManifest.xml
rename : app/src/main/java/aga/rssparser/RSSReadException.java => lib/src/main/java/aga/rssparser/RSSReadException.java
rename : app/src/main/java/aga/rssparser/RSSReader.java => lib/src/main/java/aga/rssparser/RSSReader.java
rename : app/src/main/java/aga/rssparser/Utils.java => lib/src/main/java/aga/rssparser/Utils.java
rename : app/src/main/java/aga/rssparser/model/Enclosure.java => lib/src/main/java/aga/rssparser/model/Enclosure.java
rename : app/src/main/java/aga/rssparser/model/FieldTypeAware.java => lib/src/main/java/aga/rssparser/model/FieldTypeAware.java
rename : app/src/main/java/aga/rssparser/model/RSSChannel.java => lib/src/main/java/aga/rssparser/model/RSSChannel.java
rename : app/src/main/java/aga/rssparser/model/RSSItem.java => lib/src/main/java/aga/rssparser/model/RSSItem.java
Library version is added to output aar file name.