Release v1.4.0.

This release adds some new features:

* Add configuration option to customise the Python path to make
  local libraries available to scripts.

* Allow configuration to specify which directories might contain data
  files (for the file tracking feature).

* File tracking can now also track imported Python files in configured
  directories.

pgfutils.py

@@ -36,7 +36,7 @@
 
 """
 
-__version__ = "1.4.0b1"
+__version__ = "1.4.0"
 
 # We don't import Matplotlib here as this brings in NumPy. In turn, NumPy
 # caches a reference to the io.open() method as part of its data loading