Added p009mymethods1.rd

Interpolation of methods
added p010aliasmtd.rb

Aliasing a method
Added p011vararg.rb

Variable amount of Arguments with the *
add p012mtdstack.rb

Sequence of parameters on the stack
Values passed by reference 

Also the importance of Bang methods
Strings and Arrays
If Else and Constructs
More If Else and Constructs
Ruby Code blocks and Yield