Update ABM API

[pszufe]

Chages include

• compact schedule functions to shorten code
• Remove string for identifiers (string implementation in Julia is inefficient and should be avoided for computational heavy workloads)
• Use Julia style for passing RNGs to functions
• Remove abstract types from the code (abstract types do not allow the Julia compiler to optimize memory layout) and replace them with parametrized types (perhaps the number of parameters needs to be adjusted in some cases)
• added an example doc - in future doc generation should be integrated with Travis CI
• small updates to tests - all tests pass

[pszufe]

Additional comments:

1. I have defined

   mutable struct Field2D{T<:Real,D<:Real} <: Field

perhaps

  mutable struct Field2D{T<:Real} <: Field 

could be enough I am not sure how you interpret the discretization parameter.

2.We have

struct Real2D{T<:Real} <: Position
    x::T
    y::T
end

struct Int2D <: Position
    x::Integer
    y::Integer
end

Int2D is obsolete - we could just use Real2D{Int} Note this means we probably can kick out the Position abstract type (unless you plan 3d positions to be within the same API - but then, if we wanted to have N-dimensional positions we should probably used StaticArrays).

[spagnuolocarmine]

Additional comments:

1. I have defined mutable struct Field2D{T<:Real,D<:Real} <: Field

perhaps

  mutable struct Field2D{T<:Real} <: Field 

could be enough I am not sure how you interpret the discretization parameter.

2.We have

struct Real2D{T<:Real} <: Position
    x::T
    y::T
end

struct Int2D <: Position
    x::Integer
    y::Integer
end

Int2D is obsolete - we could just use Real2D{Int} Note this means we probably can kick out the Position abstract type (unless you plan 3d positions to be within the same API - but then, if we wanted to have N-dimensional positions we should probably used StaticArrays).

The discretization parameter defines the space of field, basically is the dimension of each single bucket. Absolutely we can remove Int2D, but leave Position also for Network field and d-Dimensional field.

Thank you