add more species names patterns to be recognized
implement VSIM Dumpreader

tested if methods return right value (except getderived all methods
implemented). Using _const.axesidentify for x,y,z,px,py,pz; weight and
ID not included. All other methods should behave like for sdf.
Neverthelerss additional esting required--
use charge and mass information in particle analyzer if dumped
add scalar charge and mass information to vsim dumpreader
add support for fixed particle weight in SingleSpeciesAnalyzer

hope the conversion fix in __getitem__ doesnt break anything
improvements on vsim dumpreader

fixed collecting of h5 files in subfolders
fixed timestep
improved listSpecies
fixed typo
add VSIM Simulationsreader

closes #4

fixed wrong mass and charge return value
Merge pull request #10 from skuschel/vsimreader

Vsimreader