Add 32-bit linux support.

v1.0.0

fix: linux-386 support

Changes for ssgreg/logf

v0.3.0

fix: add logf reference

0.2.0

• feature: now client can specify his own field name transformation function in order to uppercase it or something like that
• feature: it is allowed now to pass any type of values to journald.Send

Initial version

v0.1.0

added godoc and travis badges