Fix epoch time by removing user offset

[petslane]

getEpochTime() should return epoch time that does not include offsets.

User offset is included in methods returning local times - getDay(), getHours(), getMinutes(), getSeconds(), getFormattedTime().

Fixes #35

[trapper-]

Can this be merged? the epoch time is wrong as it currently is

[aentinger]

Hi @petslane :wave: As much as I agree with your point, if we do in fact merge it then it would break compatibility with everyone who is relying on getEpochTime returning the unix epoch time + the set time offset. I'd propose a "softer" approach:

1. Add 2 new methods which are in fact doing what their name advertises

unsigned long getUnixEpochTime() const; /* Returns the true unix epoch time without time offset */
unsigned long getUnixEpochTimeWithOffset() const { return getEpochTime(); }

2. Mark getEpochTime as deprecated.

unsigned long getEpochTime() const __attribute__ ((deprecated));

3. Release a new version and wait some time.
4. Remove getEpochTime().

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