update maven plugins
adjust default channel names to match calcpos txt output
individual channel extraction, PosFiles can now have variable number of channels
also test channel extraction for AG501
extract multiple channels as individual PosFiles
new TextFile class for ASCII EMA data
BVH files are now a type of Text file
EmaFile now abstract superclass
add convenience i/o methods for string paths
sampling frequency in all EMA file types
init channel names using setter
extra vector for sample times, can be printed as well
times don't need to be a vector, add time slice extraction
retain time offset when converting to text
tweak, implement time range extraction for AG501
implement channel extraction for AG501
[maven-release-plugin] prepare release v0.3
[maven-release-plugin] prepare for next development iteration