Caching options

[BassemN]

Hello,

Thanks for this awesome library.
I'd like to see more caching options to accelerate lookup speed like caching the database file into memory using shmop PHP extension.

Thanks

[dark-rider]

Are there any caching options for MaxMind DB Reader at all?

By the way, some external examples include "reader->close();", but most and also MaxMind's own examples don't. Is the close command optional or should it even better not be used?

[oschwald]

@dark-rider, this library does not currently cache data across requests. If you are running into performance issues, I would first recommend trying the extension.

[oschwald]

Closing at this is largely a duplicate of #36.