Mysql 'utf8' do not support 4-bytes UTF8 chars.
Characters like 'KISS MARK' (U+1F48B) causes mysql
to cut the string at that point.
There is utf8mb4 encoding available on newer mysql
versions that do support 4-bytes utf8. But for storing
stanzas, that doesn't need to be indexed or searched or
inspected in any way, it was easier to use BLOB
(the bytes stored are utf8 encoded anyway, like all XMPP),
and avoids the need to redefine indexes (as allowed size
is shorter on utf8mb4) or having mixed utf8 and utf8mb4
encodings on the same table.
Use dynamic Rebar configuration
Make iconv dependency optional
Disable transient_supervisors compile option
Add hipe compilation support
Only compile ibrowse and lhttpc when needed
Make it possible to generate an OTP application release
Add --enable-debug compile option
Add --enable-all compiler option
Add --enable-tools configure option
Add --with-erlang configure option.
Add --enable-erlang-version-check configure option.
Add lager support
Improve the test suite
