PluginMananger: fixed Doxygen errors.
PluginManager: doc++
Merge branch 'master' into compatibility
TestSuite: test ability to CORRADE_VERIFY with explicit operator bool.

It will be nice to have this, currently fails to compile.
TestSuite: allow explicit bool conversion with CORRADE_VERIFY().

Not doing explicit conversion with `bool()`, but rather passing the
value to if statement, which according to the standard is allowed to do
the conversion.

I could do the explicit conversion directly in the CORRADE_VERIFY()
macro and be done with that without all this verbose code, but this is
future-proof for the time we would want to ditch those macros
altogether.
PluginManager: returning plugin instance via std::unique_ptr.

Avoids accidental leaks -- I forgot to delete static plugin in test.
examples: updated pluginmanager example.
doc: Mention that GCC*_COMPATIBILITY is sometimes needed also with Clang.

Sadly this can't be easily detected/enforced through CMake and
forgetting to do so will result in rather ugly error messages. Fixes #1.
More flexible ability to install CMake modules.

FindCorrade.cmake is not installed by default to avoid the need for
root privileges when installing, enable it with WITH_FIND_MODULE CMake
flag.

Other modules (UseCorrade.cmake and CorradeLibSuffix.cmake) are
installed to ${CMAKE_INSTALL_PREFIX}/share/cmake/Corrade for similar
reasons. FindCorrade.cmake is modified to find this path and add it to
CMAKE_MODULE_PATH, so the files can be conveniently included.
Updated toolchains submodule.
Make GCC 4.6 PKGBUILD actually compile *with* GCC 4.6.
Added PKGBUILD for compiling with GCC 4.7.
PluginManager: circumvent the need for including <windows.h>.

Should be reverted if causes issues.
Merge branch 'master' into compatibility

Conflicts:
	CMakeLists.txt
Also enable the compatibility mode in GCC 4.6 and 4.7 PKGBUILDs.
Merge branch 'master' into compatibility
Updated GCC 4.4 and 4.5 compatibility PKGBUILDs to follow the other.
TestSuite: minor cleanup.
Merge branch 'master' into compatibility
GCC 4.4 compatibility: no explicit conversion operators.