Fix 64bits coordinate

[roznet]

Hi,

1. I made the follow two changes to the code: one so that I can use the code from data already loaded in memory (in my case the data of the fit file comes from a database, not a file)
2. fixed a bug by which the gps coordinate on a 64bit system didn't apply the correction for the sign properly and thus were in correct when the location had a <0 longitude.
   Hope it's ok and helps

[adriangibbons]

Thanks @roznet once I've managed to get the Travis CI checks to run successfully I will merge!

It seems that PHP version 5.5 as it's quite old and no longer supported by default.