Implement possibility to list all text registers
Add text properties for navigation
Implement registers list and its navigation
Quick access to the list with text registers.

Quick access to the list with text registers from the minibuffer while
switching between the registers with the texts.
Add defalias to the iregister-list-text-registers
Fix method call.
Show message instead of minibuffer.

Show message instead of minibuffer when there are not text
registers. Fix for #11.
Change the message.
Change error messages.
Remove possibility to save contents of minibuffer.

It is unneeded for now as minibuffers (in which we can browse registers)
are intended to be read only. Fix for #8.
Code refactoring, reduce code duplication
Fix typo.
Fix issues which occurs when delete last item.
Quit from minibuffer in case of absence of registers.
Merge pull request #15 from atykhonov/list-text-registers

List text registers