to handle TheOldReader
Simplify and fix fetching of feed icon.
Use variables to describe specific behaviors like TheOldReader.com's ones
Add TheOldReader.com to the list of supported servers
Rename the "Google Reader" group to "OpenReader"
Fix home page determination for feeds hosted by InoReader

InoReader does not provide the "alternate" information when we fetch a feed. So we need to make use of the "htmlUrl" information provided within the subscriptions list.
Optimization
In fact, homepage info might sometimes need update…
Merge pull request #273 from barijaona/TheOldReader

Support TheOldReader.com