move marker size to style manager
triangle marker tweaks
cleaned up legend code relating to vertical spacing
minor changes
added gif and bmp export, refactored BitmapEncoder
roughed in vector export
roughed in vector export
url and version update [ci skip]
histogram tweaks
working space int to double precision
added ticker marks below and above min and max values if with a certain tolerance.
fixed broken unit test
playing around with number formatting
finished new and improved auto-decimal fomatter
bug fix in calculating min max - the min was set to Double.MIN and it should have been -Double.MAX
number formatter - fixed for decimal numbers less than 1
fixed some more decimal formatting issues
more decimal formatting issues
real-time update of error bars - issue #67
improved travis file [ci skip]