Added ext folder for storing php extensions and mbstring.so as an example

Signed-off-by: Pooyan Khosravi <pekhee@gmail.com>
updated compile to copy extensions to php/ext directory on slug compiling time

Signed-off-by: Pooyan Khosravi <pekhee@gmail.com>
updated compile to copy extensions to php/ext directory on slug compiling time

Signed-off-by: Pooyan Khosravi <pekhee@gmail.com>
configured php to load mbstring

Signed-off-by: Pooyan Khosravi <pekhee@gmail.com>
configured compile to load extensions in /app/php/ext

Signed-off-by: Pooyan Khosravi <pekhee@gmail.com>
configured compile to load extensions in /app/php/ext

Signed-off-by: Pooyan Khosravi <pekhee@gmail.com>
changed minor typo

Signed-off-by: Pooyan Khosravi <pekhee@gmail.com>
changed php.ini to use new extension path

Signed-off-by: Pooyan Khosravi <pekhee@gmail.com>