Most of the getters in TunnelEntry are almost verbatim from
net.i2p.i2ptunnel.web.IndexBean and net.i2p.i2ptunnel.web.EditBean

There are a lot of changes here:
- The main_content FrameLayout is now main_fragment (more logical name).
- TunnelEntry now stores a Context instead of a TunnelEntryLoader (so
  it can be instantiated inside the detail Fragment).
- The activity_navdrawer layout is now an alias to a one-pane or two-pane
  layout depending on screen size.
- Subclasses of I2PActivityBase can now override canUseTwoPanes() to enable
  and use the two-pane layout (for devices that support it).

Router must be started and client tunnels built before loading the I2PTunnel
Activity, or it hangs when switching tabs.

Broken: cannot find net.i2p.i2ptunnel.I2PTunnel
(but it can when launching the router)

- Show the toast
- First web page can be i2p