Skeleton for ruphy_libint2 extension
Find libint2 library
Use extconf.h
Define module RuPHY::Libint2
Define RuPHY::Libint2::compiled?
Call libint2_static_init/cleanup
Add autotest mapping for extensions
Define RuPHY::Libint2::Evaluator

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Initialize eri evaluator

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Use ruby_xfree to release evaluator buffer

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Install libint2 from ppa before CI build
Search for libint2.h
Add *.cc to libint2 extention source
Spec for Libint2::Evaluator#max_angular_momentum
Fix bug around Libint2::Evaluator@max_angular_momentum
ruby 1.9.2 workaround
Compile the main source file as C++
Use pkg-config
Explicitly cast an argument for rb_end_proc.

For compatibility with both MRI and rbx.
Change error message from extconf.rb.

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