Plus some basic classes for the symbols table
Add some types for the symbols table and the inter
1.env is the environment of the parser
2.array is the type of the basic type seq
3.split node.h into .h and .cpp
Merge branch 'master' into symbols-do
Merge branch 'master' into symbols-do
Writing test
bug fixed
Building the parser tree construct tree node.
Try to build syntax tree,but I find it is so diffcult and not such beautiful.
Finished parser and interpreter!

I used a dark technique:use UNION to do the type convertion(between int and pointer)
It is very dangerous and it seems like alright so far.
I will try to use virtual class instead of this dark trick.
Plus a script file to do the compiler and link job