Released on 2013-12-30.
* Added support for a user-defined SHTK_MODULESPATH variable. This
colon-separated, user-tunable variable lists the directories that
contain modules.
* Added a modulesdir variable to shtk.pc so that third-party packages
can install shtk-compliant modules into the shared directory. This
variable is also exposed by the SHTK_CHECK macro of shtk.m4 as
SHTK_MODULESDIR.
* Added a new bool module with a shtk_bool_check function to convert a
string to a boolean.
* Added a new cleanup module to simplify the installation and automatic
execution of termination handlers.
* Fixed the config module in Mac OS X 10.9 to respect default values
of configuration variables.
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