bind: initial step for generating vapi file for vala.
src: overall: renamed several symbols to solve the issues with generating vapi.
src: PagedPageHolder: solve the warning that gtk-doc couldn't find PageHolder
src: paged_util: changed parameter type to solve issues with GIRScanner.
tests: overall: apply change of symbols to test, so that this can pass `make distcheck`
src: paged-0.2.pc: changed into 0.2 so that it does not have issue.
NOTE: paged is still 0.1 version.
bind: add support for vala support
bind: Makefile.am: vapi install directory rewritten in $(datarootdir)
src: Makefile.am: reordered sourcelist for Paged-0.2.gir
pagebook: removed, in order to add another demo
src: PagedWindow: suppressed warning message and changed more informational.